Improvement in rubber rollers for paper-machines



N0- ll1,'751. PATENT BDFEB. 14, 1871.

.R. A. KELTY. RUBBER ROLLER'I'OR PAPER MACHINES.

F1? gala YE Elltlll r @ffi RICHARD A. KELTY, or YLAMBEBTSVILLE,'NEWJERSEY.

' Letters Patent No. 111,751, dated February 14. 1871 antcdated January 30, 1871.

lMPROVEPdENT IN RUBBER ROLLERS FOR PAPER-MACHINES.

I The Schedule referred to ln these LettemPatent and making part of the, same.

To alL-who-m. it may coiwern Be it known that I, RICHARD A. KELTY, of Lambertsville, in the county of Hunterdou and State of New Jersey, hare invented a new and valuable Improvement in Rollers for Paper-Making Machines;' and. I do hereby declare that the following is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawing making a part of this specitication, and to the letters and figures of reference marked thereon.

Figure 1 of the drawing is a side view of my roller, with a portion of the rubber removed Figure 2 is a central longitudinal section and Figure'3 is a cross-section thereof.

My invention has relation to an improvement in machines for the manufacture of paper, and consists in the novel construction of rubber rollers for couching and pressing the pulpl The cylindrical surface of the metallic core is transversely and continuously corrugated or otherwise roughened, and the rubber covering is lined (with inelastic substance, ribbed transversely, the

ribs of the lining being made considerably larger in diameter than the width of the depressions or channels of the metal cylinder.

The lctterA of the drawing represents the inner cylinder'or core of metal.

This cylinder constitutes the body of the roller, and is provided with=the journals b l).

The cylindrical surface 0 of the roller is transversely ribbed, in the manner shown, or otherwise roughened, to increase the friction ofcontact.

Care must be taken that the inequalities which compose the roughened or corrugated surface shall be fine in degree, homogeneous, and uniformly 'extended throughout the whole cylindrical surface of the metallic core.

B represents the rubber incasement or covering, to which is attached the. transversely-ribbed linmg e.

Usually, in the manufacture of my rollers, '1 prefer to wind or coil around the core a stout and hard cord.

This is then coated with cement, and the whole afterward iucasedby the rubber cylinder, which is molded thereon.

In order to understand fully the object and advantage of this mode of construction, it is necessary to state that the rollers of a paper-making machine are of large size, usually weighing upward .ot a

thousandpoimds, and they are worked under great pressure.

The metallic core composes the chief bulk of arranged to the roller, and the rubber covering is merely a -thin coating of this material, which is peculiarly adapted to the purpose of rolling out the paperpulp .The thickness of rubber and inelastic lining together is usually less than one-twelfth of the radius of the roll.

Under the great pressure of the upper roller, thetendency of the thin rubber coating is to work up in front of the'line of contact, and, becoming loose, to work ofi endwise.

Any undue irregularity in the cylindrical surface of the metallic core would also, under pressure, cause a corresponding inequality in the sheet of paper produced, as the surface of the. rubber coating would be affected thereby.

Hence, I have designed this mode of constructing these'rollers.

A suit-able friction surface is first formed on the metallic core, carc being taken that the inequalities thereof shall be uniformly extended over the surface, and that they shall be so 'finc in degree that the ribs or cords of the next layer shall not sink into the depressions when under pressure, in such a manner as to cause an inequality in the degrees of density of the rubber rolling-surface, at different points thereof.

The inelastic layer or cord-coil next.- -is arranged to envelop continuously the metal cylinder. It serves. to prevent the working up of the rubber coating under pressure, to prevent any longitudinal movementjby the engagement of its transverse ribs, both with the corrugations of the core-and also with the rubber coating by which it is enveloped, to gradually,decrease the density of the roll toward its surface, and to act asa guard or deadening layer between the corrugations of the metallic core and the more sensitive rubber coating.

The connection between the metal' core and the rubber cylinder or coating hereby attained is thought to be most intimate, while the delicate and true surface of the roll is nowisc impaired under the great pressure employed in a paper-making machine" I am aware that a roller for a wringing-ma chine has been described 'by John F. Holt in his Letters Patent No. 49,030, dated July 25, 1865, and reissued April 19, 1870, showing the rubber cylinder coufined by its attachment to a sheet of rubber bound lie in a deep groove, formed spirally around the mandrel for this purpose.

Such a mode of construction seems designed to answer an admirable purpose in a wringer-roll,

on the mandrel by a cord, which is v,

where nice equality of surface is. not of paramount importance, but I make no claim thereto.

In testimony that I elaiin the above I have \Vbat'I claim as my invention, and desire tasecuie hereunto subscribed my name 1 in the presence oi i-wewitne'sses. i by- Letters Patent, is V RICHARD A. KELTY.

The roller, herein described, consisting of the I transversely-corrugated or roughened metallic core A, the rubber cylinder B, and the ribbed lining or continuous cord-coil c, substantially as specified.

\Vitnesses:

l GHAs. A. SKILLMAN, CHAS. BLAOKWELL. 

